#include <stdio.h>

 int  main()
 {
      printf("Content-type: text/html\n\n");
      printf("<html>\n");
      printf("<head>\n");
      printf("<title>CGI Output</title>\n");
      printf("</head>\n");
  
     printf("<body>");
     printf("<h1> Hello, world. </h1>");
     printf("</body>");
     printf("</html>\n");
    return 0;
} 
